The greatest number less than 1500, which is divisible by both 16 and 18, is:

The difference of a number consisting of two digits from the number formed by inter changing the digits is always divisible by: 

Product of digits of a 2-digit number is 27. If we add  54 to the number, the new number obtained is a number formed by interchange of the digits. Find the number.

Sum of two numbers is thrice their difference. Their ratio is 

If the arithmetic means of 3a and 4b is greater than 50, and a is twice b, then the smallest possible integer value of a is: 

If an 8-digit number 1862383A is divisible by 22, find the value of A.

What least value which should be added to 1812 to make it divisible 7,11 and 14? 

Find the value of $$ {1\over{2×5}}+{1\over {5×8}}+{1\over {8 × 11}}+......{1\over {23 × 26}}=?$$